Java multithreaded programming

Compare differences in running time (efficiency) between multithreaded programming and single-threaded programming in JAVA

Code:

Package thread;

public class J extends Thread

{

private int a[];

J (int b[])

{

A=new Int[b.length];

int len=b.length;

for (int i=0;i<len;i++) a[i]=b[i];

}

public void Run ()

{

int sum=0;

for (int i=0;i<a.length;i++) sum+=a[i];

System.out.println ("Total added " +a.length+ " times " );

}

public static void Main (String args[])

{

Long T1=system.currenttimemillis ();

SYSTEM.OUT.PRINTLN (t1);

int n=0;

while (n<1000000)

{n= (int) (Math.random () *10000000);}

int a[]=new Int[n];

for (int i=0;i<n;i++) a[i]= (int) math.random () *100;

J J1=new J (a);

Try

{

J1.start ();

Long T2=system.currenttimemillis ();

System.out.println (T2);

Long t=t2-t1;

System.out.println ("The time required for single-threaded calculation is " +t);

}

catch (Exception e)

{

E.printstacktrace ();

}

int b[]=new INT[A.LENGTH/2];

for (int i=0;i<b.length;i++) b[i]=a[i];

int c[]=new Int[a.length-b.length];

for (int i=0;i<c.length;i++) c[i]=a[b.length+i];

Long T3=system.currenttimemillis ();

System.out.println (T3);

J J2=new J (b); J J3=new J (c);

Try

{

J2.start (); J3.start ();

Long T4=system.currenttimemillis ();

System.out.println (T4);

System.out.println ("The time required for double-threading calculation is " + (T4-T3));

}

catch (Exception e)

{

E.printstacktrace ();

}

}

}

Operation Result:

Java multithreaded programming